from scrapy.contrib.downloadermiddleware.useragent import UserAgentMiddleware
from scrapy import log
import random

class RandomUserAgentMiddleware(UserAgentMiddleware):
    def process_request(self, request, spider):
        user_agent_list = [
            "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 "
            "(KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1",
            "Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11 "
            "(KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
            "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.6 "
            "(KHTML, like Gecko) Chrome/20.0.1092.0 Safari/536.6",
            "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.6 "
            "(KHTML, like Gecko) Chrome/20.0.1090.0 Safari/536.6",
            "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.1 "
            "(KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.1",
            "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.5 "
            "(KHTML, like Gecko) Chrome/19.0.1084.9 Safari/536.5",
            "Mozilla/5.0 (Windows NT 6.0) AppleWebKit/536.5 "
            "(KHTML, like Gecko) Chrome/19.0.1084.36 Safari/536.5",
            "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 "
            "(KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
            "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.3 "
            "(KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
            "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_0) AppleWebKit/536.3 "
            "(KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
            "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 " 
            "(KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",  
            "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 "  
            "(KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",  
            "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 "  
            "(KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",  
            "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 "  
            "(KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",  
            "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3 "  
            "(KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",  
            "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 "  
            "(KHTML, like Gecko) Chrome/19.0.1061.0 Safari/536.3",  
            "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.24 "  
            "(KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24",  
            "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/535.24 "  
            "(KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24"  
        ]
        ua = random.choice(user_agent_list)
        if self.user_agent:
            request.headers.setdefault('User-Agent', ua)
